Texas Instruments TPS3809K33QDBVRQ1

Overview

TPS3809K33QDBVRQ1 from Texas Instruments is an automotive-grade 3-pin supply voltage supervisor IC that monitors 3.3 V system rails, asserts active-low RESET when VDD drops below 2.93 V, features 200 ms power-on reset delay, consumes only 9 μA typical supply current, and operates across −40°C to +125°C for use in engine control units and ADAS camera modules.

For engineers reviewing the TPS3809K33QDBVRQ1 datasheet, TPS3809K33QDBVRQ1 pinout, TPS3809K33QDBVRQ1 application, or TPS3809K33QDBVRQ1 equivalent, this page delivers verified technical context, precise threshold and timing specs, SOT-23 pin mapping, automotive qualification details, and validated alternative options for functional replacement in safety-critical vehicle systems.

Technical Context

The TPS3809K33QDBVRQ1 implements a precision comparator with built-in 40 mV hysteresis and internal 1.137 V reference to detect undervoltage on the VDD pin. It integrates a fixed 200 ms (120–280 ms) reset delay timer triggered after VDD rises above VIT− = 2.93 V, ensuring reliable processor initialization during power-up and brownout recovery.

This device uses push-pull RESET output capable of sourcing −500 μA (VOH ≥ VDD − 0.2 V) and sinking 500 μA (VOL ≤ 0.3 V), requires no external components, and is immune to short negative transients on VDD-making it suitable for noisy automotive 12 V battery-derived 3.3 V domains.

Key Specifications

Pinout & Package

SOT-23 (DBV) package, 2.90 mm × 1.60 mm body size, 1.45 mm max height, 3-pin configuration with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TLV809E and TPS3809L30QDBVRQ1, the TPS3809K33QDBVRQ1 uniquely combines AEC-Q100 Grade 1 certification, 2.93 V threshold matched to 3.3 V rails, and production-proven automotive qualification-making it the only option fully aligned with OEM functional safety requirements for 3.3 V domain supervision.

Availability

TPS3809K33QDBVRQ1 is available at Aetrix Electronics and suitable for automotive camera systems, engine control units, and telematics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3809K33QDBVRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company delivering analog and embedded processing solutions, with leadership in automotive, industrial, and power management technologies.

The TPS3809-Q1 product line delivers AEC-Q100-qualified voltage supervisors for automotive subsystems requiring guaranteed reset behavior during battery transients, cold-crank, and load-dump conditions.

FAQ

What is the exact reset threshold voltage of the TPS3809K33QDBVRQ1?

The TPS3809K33QDBVRQ1 has a nominal reset threshold voltage (VIT−) of 2.93 V, with a guaranteed range of 2.87 V (min) to 2.99 V (max) across −40°C to +125°C. This value is factory-trimmed and applies specifically to the TPS3809K33QDBVRQ1 variant-not other members of the TPS3809xxx-Q1 family. The 2.93 V threshold is optimized for monitoring standard 3.3 V power rails with ±5% tolerance.

Does the TPS3809K33QDBVRQ1 require external components to operate?

No, the TPS3809K33QDBVRQ1 requires no external resistors, capacitors, or timing components to perform basic voltage supervision. However, TI recommends placing a 0.1 µF ceramic decoupling capacitor between VDD and GND, located as close as possible to the device pins, to ensure noise immunity and stable operation during fast transients. All timing, reference, and output drive functions are fully integrated.

Is the TPS3809K33QDBVRQ1 pin-compatible with MAX809?

Yes, the TPS3809K33QDBVRQ1 is explicitly stated as pin-for-pin compatible with the MAX809 in its official documentation. Both devices use the same SOT-23 (DBV) 3-pin package with identical pin 1 (GND), pin 2 (RESET), and pin 3 (VDD) assignments and push-pull active-low RESET output behavior-enabling direct replacement in legacy designs without PCB modification.

What automotive qualification does the TPS3809K33QDBVRQ1 meet?

The TPS3809K33QDBVRQ1 is qualified per AEC-Q100 with Device Temperature Grade 1 (−40°C to +125°C ambient), Human-Body Model ESD Level 2 (±2 kV), and Charged-Device Model ESD Level C5 (±750 V). These qualifications are documented in the official TI datasheet and verified through TI's certified stress-test protocols-confirming suitability for under-hood and cabin electronics in passenger vehicles and light trucks.

What is the reset delay time specification for the TPS3809K33QDBVRQ1?

The TPS3809K33QDBVRQ1 features a fixed power-on reset delay time (t_d) of 200 ms typical, with a guaranteed range of 120 ms (min) to 280 ms (max) across temperature and voltage. This delay begins after VDD rises above the 2.93 V threshold and ensures the RESET output remains asserted long enough for processors like TI C2000 or ARM Cortex-M series to complete internal initialization before release.